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Reading SICP, stream primitives are used to do this sort of of "iterator" thing, right? These primitives don't seem to be in guile by default. Using a procedure that returns a stream seems to satisfy the "iterator" qualifications, and the "fetch the whole ball of wax" qualifications. It leaves more work up to the implementor, but it seems that this is what streams are for... or am I incorrect? -Peter -- Peter C. Norton Time comes into it. / Say it. Say it. spacey@pobox.com | The Universe is made of stories, http://spacey.dyn.ml.org | not of atoms. | Muriel Rukeyser "The Speed of Darknesss"